@Martin-Woodford the web site planner is pretty long in the tooth, you can holler at the moon for what it is worth but nothing is going to be updated with the current version
there are plans for a complete revamp of the web site planner, what the time line is I have no clue
MRA is only a small team & they do not have the resources to fix all the old issues like this & also produce a new revamped planner
till the new site update, I am sorry but you will just have to learn to keep an eye on the mileage